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RELIAS DYSRHYTHMIA BASIC TEST 35 QUESTIONS
2026/2027 | Basic A Dysrhythmia | Verified Answers |
Complete ECG Strip Interpretation | Pass Guaranteed - A+
Graded
Section 1: Sinus Rhythms (Q1-7)
Q1. A rhythm strip shows a regular rhythm with a rate of 72 bpm, upright P waves
preceding each QRS complex, a PR interval of 0.16 seconds, and narrow QRS
complexes. Which rhythm is present?
A. Sinus bradycardia B. Junctional rhythm C. Normal sinus rhythm D. First-degree AV
block
C. Normal sinus rhythm [CORRECT]
Rationale: Normal sinus rhythm is defined by a regular rhythm, rate 60-100 bpm,
upright P waves before each QRS, PR interval 0.12-0.20 seconds, and narrow QRS
complexes.
Correct Answer: C
Q2. A patient recovering from surgery has a heart rate of 52 bpm on the monitor.
The rhythm is regular with normal P waves, a constant PR interval of 0.18
seconds, and narrow QRS complexes. Which rhythm is present?
A. Normal sinus rhythm B. Sinus bradycardia C. Junctional escape rhythm D. First-
degree AV block
B. Sinus bradycardia [CORRECT]
Rationale: Sinus bradycardia is characterized by a sinus-origin rhythm with a rate
below 60 bpm while maintaining normal P waves, PR intervals, and QRS complexes.
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Correct Answer: B
Q3. A 28-year-old patient presents with fever and anxiety. The cardiac monitor
shows a regular rhythm at 128 bpm with upright P waves before each QRS, PR
interval 0.14 seconds, and narrow QRS complexes. The rate gradually increased
from 72 bpm over several minutes. Which rhythm is present?
A. Atrial flutter with rapid ventricular response B. Supraventricular tachycardia C.
Sinus tachycardia D. Ventricular tachycardia
C. Sinus tachycardia [CORRECT]
Rationale: Sinus tachycardia demonstrates a gradual onset and offset, regular
rhythm, rate greater than 100 bpm (typically 100-150 bpm), and maintains normal
sinus P waves with narrow QRS complexes.
Correct Answer: C
Q4. A rhythm strip shows an irregular rhythm with a rate varying between 58 and
82 bpm. P waves are upright and present before each QRS, with consistent
morphology. The PP interval varies by more than 0.12 seconds, and the rhythm
irregularity correlates with the patient's respiratory cycle. Which rhythm is
present?
A. Atrial fibrillation B. Sinus arrhythmia C. Sinus tachycardia with PACs D. Wandering
atrial pacemaker
B. Sinus arrhythmia [CORRECT]
Rationale: Sinus arrhythmia is distinguished from atrial fibrillation by the presence of
consistent, upright P waves before each QRS and a rate variation that correlates with
respiration, whereas AFib has no discernible P waves and is irregularly irregular.
Correct Answer: B
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Q5. During continuous monitoring, a patient suddenly has a pause in the rhythm
strip where an entire PQRST complex is missing. The pause measures 1.8 seconds
and is not equal to a multiple of the underlying PP interval. The underlying
rhythm is regular at 68 bpm with normal P waves. Which rhythm disturbance is
present?
A. Second-degree AV block Type I B. Sinus arrest C. Sinus exit block D. Junctional
escape beat
B. Sinus arrest [CORRECT]
Rationale: Sinus pause/arrest is identified by a missing PQRST complex where the
pause is not a multiple of the underlying PP interval, indicating failure of the sinus
node to depolarize.
Correct Answer: B
Q6. A rhythm strip demonstrates a gradually increasing then decreasing R-R
interval over several cycles. The rate varies from 64 to 88 bpm. All P waves are
upright and uniform, each followed by a QRS complex with a constant PR interval
of 0.16 seconds. The irregularity pattern repeats with respiration. Which rhythm
is present?
A. Atrial fibrillation B. Sinus arrhythmia C. Sinus tachycardia D. Wandering atrial
pacemaker
B. Sinus arrhythmia [CORRECT]
Rationale: Sinus arrhythmia presents with a phasic variation in rate (typically
increasing with inspiration and decreasing with expiration), uniform P wave
morphology, and a PP interval difference exceeding 0.12 seconds.
Correct Answer: B
Q7. Which statement accurately describes the ECG criteria for sinus bradycardia?
RELIAS DYSRHYTHMIA BASIC TEST 35 QUESTIONS
2026/2027 | Basic A Dysrhythmia | Verified Answers |
Complete ECG Strip Interpretation | Pass Guaranteed - A+
Graded
Section 1: Sinus Rhythms (Q1-7)
Q1. A rhythm strip shows a regular rhythm with a rate of 72 bpm, upright P waves
preceding each QRS complex, a PR interval of 0.16 seconds, and narrow QRS
complexes. Which rhythm is present?
A. Sinus bradycardia B. Junctional rhythm C. Normal sinus rhythm D. First-degree AV
block
C. Normal sinus rhythm [CORRECT]
Rationale: Normal sinus rhythm is defined by a regular rhythm, rate 60-100 bpm,
upright P waves before each QRS, PR interval 0.12-0.20 seconds, and narrow QRS
complexes.
Correct Answer: C
Q2. A patient recovering from surgery has a heart rate of 52 bpm on the monitor.
The rhythm is regular with normal P waves, a constant PR interval of 0.18
seconds, and narrow QRS complexes. Which rhythm is present?
A. Normal sinus rhythm B. Sinus bradycardia C. Junctional escape rhythm D. First-
degree AV block
B. Sinus bradycardia [CORRECT]
Rationale: Sinus bradycardia is characterized by a sinus-origin rhythm with a rate
below 60 bpm while maintaining normal P waves, PR intervals, and QRS complexes.
,2
Correct Answer: B
Q3. A 28-year-old patient presents with fever and anxiety. The cardiac monitor
shows a regular rhythm at 128 bpm with upright P waves before each QRS, PR
interval 0.14 seconds, and narrow QRS complexes. The rate gradually increased
from 72 bpm over several minutes. Which rhythm is present?
A. Atrial flutter with rapid ventricular response B. Supraventricular tachycardia C.
Sinus tachycardia D. Ventricular tachycardia
C. Sinus tachycardia [CORRECT]
Rationale: Sinus tachycardia demonstrates a gradual onset and offset, regular
rhythm, rate greater than 100 bpm (typically 100-150 bpm), and maintains normal
sinus P waves with narrow QRS complexes.
Correct Answer: C
Q4. A rhythm strip shows an irregular rhythm with a rate varying between 58 and
82 bpm. P waves are upright and present before each QRS, with consistent
morphology. The PP interval varies by more than 0.12 seconds, and the rhythm
irregularity correlates with the patient's respiratory cycle. Which rhythm is
present?
A. Atrial fibrillation B. Sinus arrhythmia C. Sinus tachycardia with PACs D. Wandering
atrial pacemaker
B. Sinus arrhythmia [CORRECT]
Rationale: Sinus arrhythmia is distinguished from atrial fibrillation by the presence of
consistent, upright P waves before each QRS and a rate variation that correlates with
respiration, whereas AFib has no discernible P waves and is irregularly irregular.
Correct Answer: B
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Q5. During continuous monitoring, a patient suddenly has a pause in the rhythm
strip where an entire PQRST complex is missing. The pause measures 1.8 seconds
and is not equal to a multiple of the underlying PP interval. The underlying
rhythm is regular at 68 bpm with normal P waves. Which rhythm disturbance is
present?
A. Second-degree AV block Type I B. Sinus arrest C. Sinus exit block D. Junctional
escape beat
B. Sinus arrest [CORRECT]
Rationale: Sinus pause/arrest is identified by a missing PQRST complex where the
pause is not a multiple of the underlying PP interval, indicating failure of the sinus
node to depolarize.
Correct Answer: B
Q6. A rhythm strip demonstrates a gradually increasing then decreasing R-R
interval over several cycles. The rate varies from 64 to 88 bpm. All P waves are
upright and uniform, each followed by a QRS complex with a constant PR interval
of 0.16 seconds. The irregularity pattern repeats with respiration. Which rhythm
is present?
A. Atrial fibrillation B. Sinus arrhythmia C. Sinus tachycardia D. Wandering atrial
pacemaker
B. Sinus arrhythmia [CORRECT]
Rationale: Sinus arrhythmia presents with a phasic variation in rate (typically
increasing with inspiration and decreasing with expiration), uniform P wave
morphology, and a PP interval difference exceeding 0.12 seconds.
Correct Answer: B
Q7. Which statement accurately describes the ECG criteria for sinus bradycardia?
